Color holographic display is an important goal of holographic display research. Color holographic display technology using RGB lasers is studied, and color holographic display method based on space division multiplexing is proposed. Both the size and center of holographic optoelectronic reconstruction image depend on the wavelength of RGB lasers. The method by adjusting the original sizes of the RGB components of color images and adding digital blazed grating to achieve the coincidences of the sizes and centers of RGB reconstructed images is proposed. The color holographic display system with space division multiplexing method is developed, and hologram generated by 24-bit computer is added to spatial light modulator to reconstruct the color images by the advanced physics setup. Experimental results demonstrate the feasibility of the method proposed.